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<head>
    <meta charset="UTF-8">
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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <!-- colspan 列合并 值为单元格的个数
         rowspan 行合并 值为单元格的个数 -->
   <table border="1" width="200">
        <tr>
            <td rowspan="2">1-4</td>
            <td>2</td>
            <td>3</td>
        </tr>
        <tr>
            <td colspan="2">5-6</td>
        </tr>
        <tr>
            <td>7</td>
            <td>8</td>
            <td>9</td>
        </tr>
   </table> 
</body>
</html>